Victron SmartSolar MPPT 75-10: What exact size screwdriver?

[douglasheld]

I've wired up my Victron SmartSolar MPPT 75|10 with the 2.5mm^2 double-insulated cables that came with my 120W panel, and I've put square bootlace ferrules on the ends.

However, I have not torqued these connections. I aim to buy a torque screwdriver and to re-torque these connections properly to 0.75Nm per the Victron manual. The screwdriver is a bit expensive however! I would like to buy the exact right size head for this task and be done with it.

• Torque handle: https://www.ebay.co.uk/itm/325579672667
• Torque handle blades: https://www.felo.com/fileadmin/user_upload/E-Book/E-Book-DE-EN-2022/index.html (page 106)

Flat head tip size	Length	Felo stock number	EAN
3,5 x 0,6	170 mm	100 353 94	40071576386 56
4,0 x 0,8	170 mm	100 043 94	40071576386 32
5,5 x 1,0	170 mm	100 554 94	40071576386 70

Question: Can somebody who has the same MPPT charge controller tell me exactly what size screwdriver head appears to be the most perfect fit? Thank you!

 

[sunshine_eggo]

I have no input on the torque product.

Ferrule or not? 10 AWG, 7-strand, PV wire into MPPT RS 450/200 - Victron Community

community.victronenergy.com

 

[douglasheld]

Eh, you know what? I found some of my driver bits have size markings on them, some do not. Nevertheless, I do have a micrometer on hand.

For this particular device, Victron SmartSolar 75/10 MPPT Charge Controller, the ideal flat screwdriver head for the terminal connections appears to be 4,1mm wide, 0,9mm thick. So, I'll go with the middle option.

 

[douglasheld]

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Ferrule or not? 10 AWG, 7-strand, PV wire into MPPT RS 450/200 - Victron Community

community.victronenergy.com

Thank you, I had no idea! That's an easy fix, for me to snip off the ferrules again.